Banjarmasin weather in September

In September, Banjarmasin sees average daytime highs of 32°C and overnight lows near 24°C, with 69 mm of rain across 10.6 wet days and about 12 hours of daylight. It is the 1st-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 18% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Banjarmasin's 3rd-clearest and 2nd-windiest month. For the whole year in context, see Banjarmasin's year-round climate.

Daytime high
32°
1st warmest
Overnight low
24°
3rd coldest
Rainfall
69 mm
10.6 wet days
Daylight
12 hours
6:16 AM – 6:15 PM
Cloud cover
68%
3rd clearest
Wind
9 km/h
2nd windiest
Solar energy
5.58 kWh/m²
Travel score
3.7
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 32°C through the month.

A typical September day in Banjarmasin reaches about 32°C in the afternoon and slips back to 24°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 34°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13224
23224
33224
43224
53224
63224
73224
83224
93224
103224
113224
123224
133224
143224
153224
163224
173224
183224
193224
203224
213224
223224
233224
243224
253224
263224
273224
283224
293224
303224

How September really feels in Banjarmasin

Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Banjarmasin weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 24°28928.712.22.5
Feb31° / 25°24624.812.12.6
Mar31° / 25°27728.2122.5
Apr31° / 25°23627.311.92.4
May31° / 25°14922.511.93.0
Jun31° / 24°11317.511.83.6
Jul31° / 24°8914.511.84.0
Aug32° / 24°529.311.94.2
Sep32° / 24°6910.6123.7
Oct32° / 24°15218.212.13.1
Nov31° / 25°25427.612.22.4
Dec31° / 24°32829.512.22.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14060
24060
34060
44060
53961
63862
73862
83862
93862
103862
113862
123862
133862
143961
153961
163862
173862
183862
193862
203862
213862
223862
233862
243862
253763
263565
273565
283466
293268
303169

Chance of precipitation in September

Any precipitation

Banjarmasin gets around 69 mm of rain over 10.6 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 36% and peaks near 44% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
133
233
333
433
533
633
733
833
933
1033
1133
1233
1333
1433
1534
1634
1734
1835
1935
2036
2137
2237
2338
2438
2539
2640
2741
2842
2943
3044

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the oppressive band about 72% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
1167311
2177211
3177211
4177211
5177310
6187210
7187210
8187210
9187210
10187111
11187111
12187111
13177112
14177112
15167113
16157213
17147214
18137215
19137215
20127216
21107416
22107317
2397417
2487418
2577419
2677320
2767321
2867222
2967123
3057124

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over September. Sunrise moves from 6:23 AM to 6:10 AM, and sunset from 6:19 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:236:19
211.96:236:19
311.96:226:19
411.96:226:19
511.96:226:18
612.06:216:18
712.06:216:18
812.06:206:18
912.06:206:17
1012.06:196:17
1112.06:196:17
1212.06:186:17
1312.06:186:16
1412.06:176:16
1512.06:176:16
1612.06:166:15
1712.06:166:15
1812.06:166:15
1912.06:156:15
2012.06:156:14
2112.06:146:14
2212.06:146:14
2312.06:136:13
2412.06:136:13
2512.06:126:13
2612.06:126:13
2712.06:116:12
2812.06:116:12
2912.06:116:12
3012.06:106:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.58 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.09 kWh/m² to a high of 5.58 kWh/m² in September across the year — September's 5.58 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.6Bright
295.6Bright
305.5Bright
Planning a trip in September

Hazard calendar for Banjarmasin

In seasonPeak

None of Banjarmasin's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Banjarmasin's rainy season runs October–May, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Banjarmasin?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.7
Sightseeing
3rd-best month of the year
6.1
Beach & pool
2nd-best month of the year

September is a weaker month for outdoor sightseeing in Banjarmasin. The water and warmth also suit a beach or pool day.

What to pack for Banjarmasin in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Banjarmasin sees daytime highs around 32°C and nights near 24°C. Pack light clothes. Worth having: rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

Sea temperature near Banjarmasin in September

The nearest coast averages about 28°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 34 km away) is warmest in April at about 30°C and coldest in August near 28°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar30Tropical
Apr30Tropical
May30Tropical
Jun29Tropical
Jul28Tropical
Aug28Tropical
Sep28Tropical
Oct29Tropical
Nov30Tropical
Dec29Tropical

UV index in Banjarmasin in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Banjarmasin peaks around February 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 at about 10 (extreme).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 17UV 15Jun 23UV 10
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar14Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Extreme
Aug12Extreme
Sep13Extreme
Oct12Extreme
Nov13Extreme
Dec13Extreme

Air quality in Banjarmasin in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Banjarmasin is worst in September — around 89 µg/m³ PM2.5 (unhealthy), about 4.4× the cleanest month (January, 20 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0306090JanFebMarAprMayJunJulAugSepOctNovDecModerateUnhealthyModerateSep 2287 µg/m³Jan 1520 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb23Moderate
Mar26Moderate
Apr27Moderate
May28Moderate
Jun28Moderate
Jul28Moderate
Aug39Poor
Sep89Unhealthy
Oct82Unhealthy
Nov44Poor
Dec22Moderate
Location & terrain

Where is Banjarmasin?

Banjarmasin sits at 3.3°S, 114.6°E, 8 m above sea level, in Indonesia. The nearest listed city is Banjarbaru, 30 km away.

Topography around Banjarmasin

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Banjarmasin.

Within 3 km, the terrain around Banjarmasin has only modest variations in elevation — a maximum elevation change of 16 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 16 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,313 m.

The land around Banjarmasin is covered by artificial surfaces (76%) within 3 km, cropland (42%) and trees (26%) within 16 km, and trees (49%) and water (20%) within 80 km.

3 km
16 m
16 km
16 m
80 km
1,313 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Banjarbaru 30 km · Martapura 32 km · Kualakapuas 41 km · Barabai 120 km · Amuntai 124 km · Palangkaraya 145 km · Tanjung 157 km · Sampit 202 km

Indonesia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,060
2025
Happiness
5.6 / 10
World Happiness, 2025
Safe drinking water
30%
of population, 2024
Homicide rate
0.3
per 100k, 2022
Road deaths
11.3
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 471
Religion
Muslim 87%Protestant 8%Roman Catholic 3%Hindu 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Banjarmasin (-3.3199°, 114.5907°, elevation 8 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).